There’s currently three map packs available for Fire Emblem: Awakening which adds heroes and areas  for easier grinding/leveling-up your heroes —the Champions of Yore pack, the Golden Pack and the Lost Bloodlines pack.

The video below details two upcoming Map packs, the  Smash pack and the Rogues Pack (after the review of the current set of downloadable maps)

The Smash pack rewards you with an item to convert your units into the new Bride class and adds  Elincia, Eirika and Lyn to your line up while the Rogues pack adds Epheraim, Cecilia and Ike. No details on release date and pricing as of yet.